基本解释[機] 半圓銼词组短语短語middle half -round file 中半圓銼half -round d middle file 半圓中銼smooth half -round file 細半圓銼half-round file更多词组英英字典柯林斯英英字典 a file having a semicircular cross-section half-round file剑桥字典half-round file柯林斯字典专业释义機械工程半圓銼半元銼